package com.spring.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        登陆成功之后应该有用户的session；
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null) {//没有登录
            request.setAttribute("msg", "没有权限，请先登录");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;//没有登录就是false
        } else {
            return true;
        }
    }

}
